| //===-- HashExtras.h - Useful functions for STL hash containers -*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains some templates that are useful if you are working with the |
| // STL Hashed containers. |
| // |
| // No library is required when using these functinons. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef SUPPORT_HASHEXTRAS_H |
| #define SUPPORT_HASHEXTRAS_H |
| |
| #include "Support/hash_map" |
| #include <string> |
| |
| // Cannot specialize hash template from outside of the std namespace. |
| namespace HASH_NAMESPACE { |
| |
| template <> struct hash<std::string> { |
| size_t operator()(std::string const &str) const { |
| return hash<char const *>()(str.c_str()); |
| } |
| }; |
| |
| // Provide a hash function for arbitrary pointers... |
| template <class T> struct hash<T *> { |
| inline size_t operator()(const T *Val) const { |
| return reinterpret_cast<size_t>(Val); |
| } |
| }; |
| |
| } // End namespace std |
| |
| #endif |
